Saw-mill



(No Model.) 2 Sheets-Sheet 1.

P. MQG. GHISHOLM.

SAW MILL.

PatentedJune 1Q, 1884.

(No Model.) 2 Sheets-Sheet 2.

P. MoG. OHISHOLM.

SAW MILL.

Patented June-10 PETERS, Phawmhemm Wmhmglon n c UNITED. STATES PATENT ri es.

PETER MCG. CHISHOLM, OF SAN FRANCISCO, CALIFORXIA.

SAWY-MILL.

SPECIFICATION forming part of Letters Patent No. 300,216, dated June 10, 1884.

Application filed November 5,1883.

' vention, and are referred to simply to give a shaft, and a guide for the saw, all of which I I 5 shall hereinafter fully explain, refcren ce being made to the accompanying drawings, in which I Figure l is a perspective view of my sawmill. Fig. 2 is a perspective view showing the pawl-and-ratchet mechanism for adjusting the set-beam. Fig. 3 is aside elevation of same, showing the independent pawls Z. Fig. 4 is a vertical section of my improved friction-bush. Fig. 5 isa vertical section of my adjustable boxes for the saw-shaft. Fig. 6 is a side elevation of the mechanism shown in Figs. 2 and 3, to show the reversing-pawl.

The object of my improvements is generally to render more perfect and operative the several parts.

A represents, generally, the main frame work of the mill 5 and it consists of suitable longitudinal and cross beams. This frame is made, for the sake of portability, in three separate divisions-an end section being designated by a, the central section by a, and the other end by c These sections are framed together, when set up, by halving their ends in and securing them by bolts (6. By removing these bolts they may readily be separated and laid on one another for convenience in transportation.

13 is the reciprocating carriage, operating by means of the friction-shaft O, carrying friction-pulley a, shaft D, carrying friction-wheel carriage being reversed by a friction-rollcr, E, operated by an elbow-lever, F, against a belt, f, extending from the shaft D to the saw-shaft G. These devices constitute no part of my iu- (l, and cablepulley d, and the cable 0, said (No model.)

better understanding of my improvements.

Upon the carriage are the cross-beams H,

over which the adjustable set-beam I, carrying the knees t, moves. The means for adj usting this set-beam forward or back constitute my second improvement. Two of the beams H are made into racks, with which mesh pinions j on the ends of a shaft, J, mounted in bearings extending backwardly from the setbeam. Near one en d this shaft carries a ratchetwheel, K, Fig. 1

Journaled upon the shaft, on each side of the ratchet, by means of its forked end,'is a lever, L, in the fork of which, above theratchct, are pivoted anuinber of independent pawls, 1, adapted to engage with the teeth of said ratchet on the forward stroke of the lever, in order to set the beam up. Each of these pawls has its own adjustment as to engaging with the ratchet, by reason of each being formed with its engaging-notch in a different position, plane, or line from the others, as shown in Fig. 3. By means of this the spaces or pitch of the ratchet-teeth are practically reduced, as a: slight movement of the lever will cause some one of the pawls to engage, and at the same time the more desirable result of holding the ratchet where set is obtained, because some of the pawls are always ready to or are in actual 8o engagement therewith, no matter where set.

- In the upper end of lever L is journaled a a short arm, m, Fig. 1, adapted to be oscillated in its bearing. In its forward end is pivoted the lever-handle M, adapted thus to have a vertical movement and also an oscillating one. A red, N, isconnected at its upper end to the arm at, and at its lower end to a crank, 92, pivoted on the fork of lever L, Fig. 2. With the end of this crank, Fig. 2, is connected a a rod, a, passing under all the pawls. By moving handle M in a direct line the lever L is vibrated to cause the operation of its pawls in engaging the ratchet-wheel and by turning said handle the arm at is turned, raising the 5 red N, crank a, and rod a, to lift and hold all the pawls out of engagement with the ratchet-whecl, when it has to bereversed by the means I shall now describe. This ratchetwheel is a double one, here shown as having IOO formed on one edge teeth 70 in a reverse direction, Fig. 2. With these. engages a gravitating pawl, 70, also pivoted in the lever L, Fig. 6. The rod or extends its end over the forward end of pawl k, and is heavy enough to hold its rear end up out of engagement with the ratchet-teeth k, so that said pawl does not.

engage at all as long as the series of pawls Z are operating to turn the ratchet forward; but when these are raised by the rod 02 the pawl 70 is released from said rod and drops its rear end into the teeth 70, and every stroke of the lever L reverses the ratchet and throws the setbeam back.

My next improvement relates to the boxing in which the end of shaftG is mounted, and adapted tobe pressed down or raised up by the lever F, in order to throw the frictionrollers c d or the roller E and belt f into engagement, respectively, to accomplish the reciprocation of the carriage, as is usual in sawmills. This boxing is seen in section in Fig. 4. It consists of a casing, 0, having a cap, 0.

- In the bottom of the casing and lower surface of the cap are concaved surfaces 1), on each side of which are straight surfaces 19. The shaft 0 passes through an eccentric, I, within the box,"having convex lugs or projecting surfaces (1, adapted to fit within the concaved surfaces p of the casing and cap. The lever F is loose upon shaft 0, but is firmly connected with the outer face of eccentric P. One end of the cap is provided with a cylindrical chamber, r, in which is a rubber cushion, R, upon top of which is a cap, 8, lying on the rubber alone. and held down bya bolt, S, passing through it, therubber, the cap 0, and secured in the main casing O. The other end of the cap 0 is loosely bolted, hinged, or pivoted to the casing.

The operation is as follows: The lever F, which is fast on the eccentric P, and when operated to turn said eccentric, the latter operating within the boxing, raises or lowers the shaft for the purpose described; but without some further device it would require the operator to keep hold of lever F to make it stay in the position set, but in this case the convex lugs on the eccentric move from their concave bearings against the straight portions on either side. Against these they are bound with sufficient friction to hold them in place, because the cap 0, which is pressed upward by them,

is under the influence of the rubber cushion Therefore the operator need not bearing in acorresponding socket, t, in the beams of the frame, and of a sleeve, U, through which the shaft passes. This sleeve is set within the outer frame, and is adjusted by means of oppositely-placed set-screws u, as shown. Instead of allowing the weight of the sleeves and shaft to come upon the outer frames, which would cause them to turn hard, they are supported on the heads of bolts v, rising through the frame-beams and frame T. By loosening the set-screws the outer frames, T, may be turned .to any desired inclination, and the sleeves may again be adjusted to the changed inclinations by the screws.

In Fig. 1 I show the means by which I adjust the guide or set \V for the saw. This is a forked'piece embracing the rim. of the saw, as usual. It has a shank, w, passing through a block, as, and having an arm, w, on its end, through which a set-screw, y, passes and impinges against the block. By moving this setscrew the guide may be properly adjusted.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. In a saw-mill, the beam-setting ratchetwheel K, having teeth is on one edge, reversed as described, in combination with the lever -L, having the series of independent pawls engaging with the ratchet Z, to turn it forward, and the gravitating reversed pawl k, engaging with teeth 70, to reverse said ratchetwheel, the oscillatingbearing m in the top of the lever, the lever-handle M, pivoted to move vertically in said bearing, the rod N, connected with the bearing, the crank a, connected with the rod, and the cross-rodn, connected withthe crank and passing under the series of pawls Z and over the rear end of pawl 7c, whereby when said pawls Z are down in engagement the pawl is thrown out, and vice versa, substantially as herein described.

2. In a saw-mill, the shaft 0, eccentric P loose thereon and having the convex lugs or projections q, and the lever F on the eccentric, in combination with the boxing consisting of the casing O and cap 0, each having the concave or recessed surfaces 1) and straight surfaces p, and a means for connecting the cap to the casing to allow it to yield when the eccentric is turned, and yet press upon said i eccentric, substantially as and for the purpose herein described.

3. In a saw-mill, the shaft 0, eccentric P projections q, and the lever F on the eccentric, in combination with the boxing consisting of the casing O and cap 0, each having the concaved or recessed surfaces 9 and straight surfaces 1), said cap having a hinge or pivot her 1- at the other, the rubber cushion B therein, the cup 8 on top of said cushion, and the bolt S, binding the cushion to the casing 0, substantially as and for the purpose herein described. I

loose thereon and having the convex lugs or connection to the casing at one end, the cham- I 4:. In a saw-mill, the adjustable boxes for T, mounted to turn in the beams of the frame, the saw-shaft, consisting of the outer casings, the sleeves Uand set-screws a, and the bolts n, T, having bottom bearings adapted to turn supporting the sleeves, substantially as herein in beams of the frame, the sleeves U, through described.

5 which the saw shaft passes, and the set- In Witness whereof I have hereunto set my I 5 screws a, passing through the outer casing and hand. impinging against the sleeves, substantially PETER MOG. GHISHOLM. as herein described. "Witnesses:

5. In a saw-mill, the adjustable boxes for S. H. NOURSE,

i 10 the saw-shaft, consisting of the outer casings, O. -D. COLE. 

